Today, Half-Life turns 10 years old. What started off as a humble beginning for Valve software, using dated technologies licensed from id Software, now stands as one of the greatest PC games ever made. At 10, Half-Life enjoys a lavish Metacritic score of 96%, an aggregate of all known participant reviews.

To celebrate the occasion, Valve is giving away copies of Half-Life via Steam for 98¢ (US $ 0.98), to symbolize the year 1998. This offer ends 12:01 pm PST on November 21. Visit Steam Games for more details.